package com.guarantee.server.common.utils;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * @Author huisonglin
 * @Description
 * @PackageName base-server-spring-boot
 * @Package com.guarantee.server.common.utils
 * @Date 2022/11/24 11:51
 * @Version 1.0
 */
public class DownResouceUtil {


    public static void writeByteFileFromUrlToLocal(String fileUrl, String path) throws Exception {
        URL url = new URL(fileUrl);
        //打开连接
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        //设置请求方式为"GET"
        conn.setRequestMethod("GET");
        // 因为有的网站资源是要携带cookie的，通过RequestProperty 添加请求头
        //超时响应时间为10秒
        conn.setConnectTimeout(60 * 1000);
        //通过输入流获取图片数据
        InputStream is = conn.getInputStream();
        //得到图片的二进制数据，以二进制封装得到数据，具有通用性
        byte[] data = readInputStream(is);
        //创建一个文件对象用来保存图片，默认保存当前工程根目录，起名叫Copy.jpg
        File imageFile = new File(path);
        //创建输出流
        FileOutputStream outStream = new FileOutputStream(imageFile);
        //写入数据
        outStream.write(data);
        //关闭输出流，释放资源
        outStream.close();
    }

    public static byte[] readInputStream(InputStream inStream) throws Exception {
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        //创建一个Buffer字符串
        byte[] buffer = new byte[6024];
        //每次读取的字符串长度，如果为-1，代表全部读取完毕
        int len;
        //使用一个输入流从buffer里把数据读取出来
        while ((len = inStream.read(buffer)) != -1) {
            //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
            outStream.write(buffer, 0, len);
        }
        //关闭输入流
        inStream.close();
        //把outStream里的数据写入内存
        return outStream.toByteArray();
    }

    public static BufferedInputStream saveToFile(String destUrl) {
        FileOutputStream fos = null;
        BufferedInputStream bis = null;
        HttpURLConnection httpUrl = null;
        URL url = null;
        int BUFFER_SIZE = 1024;
        byte[] buf = new byte[BUFFER_SIZE];
        int size = 0;
        try {
            url = new URL(destUrl);
            httpUrl = (HttpURLConnection) url.openConnection();
            httpUrl.connect();
            bis = new BufferedInputStream(httpUrl.getInputStream());
            return bis;
        }  catch (Exception e) {
        } finally {
            try {
                fos.close();
                bis.close();
                httpUrl.disconnect();
            } catch (IOException e) {
            } catch (NullPointerException e) {
            }
        }
        return null;
    }

//    public static void main(String[] args) {
//        saveToFile("http://123.60.33.90:8086/esignproweb/rest/file-system/operation/download?fileKey=$6b77eecc-2f66-4833-b31c-fa0311db9673$1300139707&signature=h4e0y3CZ1dUCdc6Ifxkevw0PPag%3D%0A&expire=1671853141238&type=pdf");
//    }
}
